JPH11143751A - Reproducing device and method for recognizing file system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accelerate a file system recognition processing, and to reduce the waiting time of a user. SOLUTION: Even when a data request from a host device is not generated, a reproducing device which is turned into a READY state reads judgment data necessary for judging a file system of data recorded in a loaded recording medium from a recording medium. When a request for judgement data from the host device is generated, the reproducing device transfers and outputs the recorded judgement data to the host device. That is, when the request for the transfer of the judgment data is generated, the reproducing device immediately transfers the judgment data to the host device without performing access to the recording medium. Thus, the processing can be accelerated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus capable of performing a reproducing operation corresponding to a recording medium such as an optical disk, and an information system comprising the reproducing apparatus and a host device. It relates to recognition processing.

[0002]

2. Description of the Related Art As an optical disk recording medium, so-called C
CD (Compact Disk) type discs such as D-ROM and DVD (Digita
l Discs called Versatile Disc / Digital Video Disc) have been developed. In a reproducing apparatus corresponding to these optical discs, data is read by irradiating a track on the disc with laser light and detecting the reflected light.

[0003] Such a reproducing apparatus is positioned as a slave device to a host device such as a host computer, performs a disk reproducing operation in response to a read command (data transfer request) from the host computer, and transfers reproduced data to the host device. Send (transfer) to a computer. In such a system, the host computer uses a disk (CD-ROM) loaded in the playback device.
And the file structure (file system) of the data recorded on the DVD or DVD). That is, by recognizing the file system and data contents of the disk, the host computer can issue a request for reading necessary information to the reproducing apparatus.

[0004] By the way, the playback device has a TOC (Table of Content) recorded on the disc after power-on or reset, or when the disc is replaced.
By performing an initial operation of reading management information such as NTS), reading access of various data to the disk becomes possible, that is, a state in which the host computer is ready for a reproducing operation (READY state). On the other hand, when the host computer confirms that the playback device is in the READY state, it performs an operation for setting various parameters and the like for the playback device and an operation for recognizing data contents and a file system. For example, first, a request for transfer of TOC data is made, a state is set in which the host computer can instruct the reproducing apparatus to access the disk, various settings are made, and the structure of the data file recorded on the disk is recognized. Then, the playback device is requested to provide the determination data necessary for the file system recognition. In response to this, the reproducing device reads predetermined data serving as discrimination data from the disk and transfers the data to the host computer. The host computer grasps the file structure of the disc based on the transferred discrimination data, and fetches necessary information such as a directory, thereby enabling an appropriate disc access instruction. That is, the playback device and the host computer function as one of the information systems.

[0005]

By the way, it is preferable that, for example, after the power of the reproducing apparatus is turned on or the disc is replaced, it is possible to shift to the normal operation state as quickly as possible. For example, during the above-mentioned initial operation, or during the processing such as the information collection processing and the setting processing regarding the disk from the host computer after the state becomes the READY state,
The user will have to wait. For example, when applied to a personal computer and a CD-ROM drive, the waiting time is a period during which the operation of the application or content recorded on the CD-ROM can be started / executed. Needless to say, it is desirable for the user to reduce such time.

[0006]

SUMMARY OF THE INVENTION In view of the above problems, the present invention speeds up and improves the efficiency of file system recognition processing, thereby realizing the processing desired by the user on the host device and the playback device. The purpose is to shorten the time until the start.

For this reason, in the reproducing apparatus, the control means completes the initial operation for enabling read access to data recorded on the loaded recording medium, and completes the read operation.
At the time of the Y state, even if a data request from the host device has not occurred, it is necessary to determine the file system of the data recorded on the recording medium from the loaded recording medium. The determination data is read by the reading means and stored in the storage means. Then, when there is a request for the discrimination data from the host device, control is performed so that the discrimination data stored in the storage means is transferred and output to the host device. That is, when the reproducing apparatus itself becomes accessible, the necessary discrimination data is read out thereafter, and when a transfer request for the discrimination data is made, the discrimination data can be immediately transferred to the host device without accessing the recording medium. To

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A reproducing apparatus using an optical disk as a recording medium will be described below as an embodiment of the present invention.
The optical disc loaded in the reproducing apparatus of this example is, for example, C
CD-type discs such as D-ROM and DVD (DIGI
A disk called “TAL VERSATILE DISC / DIGITAL VIDEO DISC” can be considered. Of course, the present invention can be applied to a disc reproducing apparatus corresponding to other types of optical discs.

FIG. 1 is a block diagram of a main part of a reproducing apparatus 70 according to the present embodiment. The disk 90 is loaded on the turntable 7, and is rotated at a constant linear velocity (CLV) or a constant angular velocity (CAV) by the spindle motor 1 during a reproducing operation. The pickup 1 reads data recorded on the disk 90 in the form of embossed pits or phase change pits. In the pickup 1, a laser diode 4 serving as a laser light source, a photodetector 5 for detecting reflected light, an objective lens 2 serving as an output end of the laser light, and a laser beam are irradiated on the disk recording surface via the objective lens 2. Further, an optical system for guiding the reflected light to the photodetector 5 is formed. The objective lens 2 is held by a biaxial mechanism 3 so as to be movable in a tracking direction and a focus direction.
The entire pickup 1 can be moved in the disk radial direction by a thread mechanism 8.

The information on the reflected light from the disk 90 is detected by the photodetector 5, converted into an electric signal corresponding to the amount of received light, and supplied to the RF amplifier 9. The RF amplifier 9 includes a current-voltage conversion circuit, a matrix operation / amplification circuit, and the like corresponding to output currents from a plurality of light receiving elements as the photodetector 5, and generates necessary signals by matrix operation processing. For example, it generates an RF signal as reproduction data, a focus error signal FE for servo control, a tracking error signal TE, and the like. The reproduction RF signal output from the RF amplifier 9 is supplied to a binarization circuit 11, and the focus error signal FE and the tracking error signal TE are supplied to a servo processor 14.

The reproduced RF signal obtained by the RF amplifier 9 is 2
By being binarized by the value conversion circuit 11, it is converted into a so-called EFM signal (8-14 modulated signal; in the case of CD) or an EFM + signal (8-16 modulated signal; in the case of DVD), and supplied to the decoder 12. The decoder 12 performs EFM demodulation, error correction processing, and the like.
The information read from the disk 90 is reproduced by performing M decoding, MPEG decoding and the like.

The decoder 12 accumulates EFM-demodulated data in a cache memory 20 as a data buffer, and performs error correction processing and the like on the cache memory 20. Then, the buffering to the cache memory 20 is completed in a state where the error is corrected and the reproduced data is proper. As the playback output from the playback device 70, the data buffered in the cache memory 20 is transferred and output.

The interface section 13 is connected to an external host computer 80, and is connected to the host computer 80.
The communication of the reproduction data and the read command is carried out with the device. That is, the reproduction data stored in the cache memory 20 is transmitted to the host computer 80 via the interface unit 13.
Is output to The read command and other signals from the host computer 80 are transmitted to the interface unit 13.
Is supplied to the system controller 10 via the.

The servo processor 14 detects various focus, tracking, thread, and spindle servo drives based on a focus error signal FE and a tracking error signal TE from the RF amplifier 9 and a spindle error signal SPE from the decoder 12 or the system controller 10. A signal is generated to execute a servo operation. That is, the focus error signal FE and the tracking error signal T
A focus drive signal and a tracking drive signal are generated according to E and supplied to the two-axis driver 16. The two-axis driver 16 drives the focus coil and the tracking coil of the two-axis mechanism 3 in the pickup 1. As a result, a tracking servo loop and a focus servo loop are formed by the pickup 1, the RF amplifier 9, the servo processor 14, the two-axis driver 16, and the two-axis mechanism 3.

The servo processor 14 sends a spindle error signal SP to the spindle motor driver 17.
The spindle drive signal generated according to E is supplied. The spindle motor driver 17 applies, for example, a three-phase drive signal to the spindle motor 6 according to the spindle drive signal, and executes the CLV rotation of the spindle motor 6. Further, the servo processor 14 generates a spindle drive signal in response to a spindle kick / brake control signal from the system controller 10, and causes the spindle motor driver 17 to execute operations such as starting or stopping the spindle motor 6.

The servo processor 14 generates a thread drive signal based on, for example, a thread error signal obtained as a low-frequency component of the tracking error signal TE or an access execution control from the system controller 10 and supplies the thread drive signal to the thread driver 15. . The thread driver 15 responds to the thread drive signal by the thread mechanism 8.
Drive. Although not shown in the thread mechanism 8, a main shaft for holding the pickup 1, a thread motor,
The pickup 1 has a required sliding movement by having a mechanism such as a transmission gear and driving the sled motor 8 by the sled driver 15 according to the sled drive signal.

The laser diode 4 in the pickup 1 is driven by a laser driver 18 to emit laser light. The system controller 10 sets the control value of the laser power in the auto power control circuit 19 when executing the reproducing operation on the disc 90, and the auto power control circuit 19 performs the laser output according to the set laser power value. The laser driver 18 is controlled so as to be operated.

When the apparatus is capable of performing a recording operation, a signal modulated according to recording data is applied to the laser driver 18. For example, when recording is performed on a recordable type disc 90, the recording data supplied from the host computer to the interface unit 13 is added with an error correction code by an encoder (not shown),
After processing such as EFM + modulation is performed, the data is supplied to the laser driver 18. Then, the laser driver 18 causes the laser diode 4 to perform a laser emission operation according to the recording data, so that data recording on the disk 90 is performed.

The above-described various operations such as servo, decoding, and encoding are controlled by a system controller 10 formed by a microcomputer.
For example, as a series of reproduction operation control, the system controller 10 issues a command to the servo processor 14 as an operation for reading a requested data section in response to a read command from the host computer 80, and transfers the read data with the read command. The access operation of the pickup 1 targeting the start position of the requested data section is executed. After the access is completed, control is performed to cause the decoder 12 and the cache memory 20 to execute necessary processing and to transfer the reproduced data (requested data) from the interface unit 13 to the host computer 80.

A read command from the host computer 80, that is, a transfer request, includes a request start address which is the first address of the requested data section, a request data length (data length) as a section length from the first address. Become. For example, request start address =
A transfer request of N, request data length = 3 is LBA "N"
LBA “N + 2” means a data transfer request of three sectors. Note that LBA is a logical block address (LOGICA
L BLOCK ADDRESS), which is an address given to the data sector of the disk 90.

In such a reproducing apparatus 70, when power is turned on or reset, or when a disk is exchanged, the reproduction of disk reproduction data to the host computer 80 (actual data transfer as an application or content) is executed. The following describes the processing performed as preparation for.

FIG. 2 shows the processing executed by the reproducing apparatus 70 under the control of the system controller 10 at the time of power-on / reset / disc replacement, and the like. As the raising operation, the spindle is started, each servo is set, and when the data can be read from the disk 90, the TOC data recorded in the innermost area of the disk 90 is read. The read TOC data is stored in the cache memory 20 or a memory inside the system controller 11.

When the processing for reading the TOC data is completed, the reproducing apparatus 70 enters a so-called READY state (F10).
2) If only the reproducing device 70 is considered, a disk access operation for desired data reading can be performed based on the control of the system controller 10. However, considering the system with the host computer 80, the host computer 80 issues a command (READY check) for periodically confirming that the reproducing apparatus 70 is in the READY state, for example, after the operation of the reproducing apparatus 70 starts. The playback device 70 performs READ in step F102.
If such a command is issued after entering the Y state, the host computer 80 is notified of the entry into the READY state (F10).
3).

After confirming the READY state of the reproducing apparatus 70, the host computer 80 sequentially issues commands as a request for TOC data and a mode sense (requests for various processing and parameter setting / presentation). The device 70 responds to these commands by, for example, transferring and outputting TOC data in step F104,
The setting / notification process for the mode sense 05 is performed.

As described above, the host computer 80 issues various commands and sets the system with the playback device 70. Following the TOC data and parameter setting,
A process for determining a file system recorded on the disk 90 is performed. That is, a transfer request of the determination data of the file system is made. The reproducing device 70 performs the transfer output of the discrimination data in step F107 in response to the transfer request of the discrimination data.
Immediately before 107, that is, at the time when the host computer 80 issues a transfer request for the determination data, the necessary data as the determination data has already been read from the disk 90 and stored in the cache memory 20. FIG. 2 shows processing performed in parallel with the above series of processing as step F106.
In the READY state, when the disk is accessible and the file system determination data is read from the disk 90 in step F106, the data is buffered in the cache memory 20.

Therefore, when the host computer 80 issues a request to transfer discrimination data, it is not necessary to perform disk access in the process of step F107, and the discrimination data read from the cache memory 20 is transferred and output as a cache hit transfer. I just need.

During such processing, the playback device 70
FIG. 3 shows the flow on the time axis for each processing and communication between the host computer 80 and the host computer 80. For example, assume that the playback device 70 starts the initial operation as step F101 at time t0. During this time, the host computer 80
Playback device 7 while issuing a command as a Y check
Wait for 0 to be in the READY state. Note that, of course, at the time when the playback device 70 is not in the READY state, the playback device 70 responds to the READY check command with “NOT
READY ".

Assuming that the reproducing apparatus 70 is in the READY state at the time point t1, the reproducing apparatus 70 responds to the READY check command from the host computer 80 after the time point t1 as a READY notification. By confirming this notification, the host computer confirms the READY of the reproducing device 70 at the time point t2, and then enters a preparation process as a system. Then, as described in steps F104 and F105 in FIG. 2, the transfer of the TOC information, the parameter setting, and the like are performed between the host computer 80 and the playback device 70. On the other hand, the playback device 70
In this case, since disk access is possible, data necessary for discriminating the file system is
And buffering.

For example, at time t3, as part of the preparation process,
The host computer 80 performs a file system discriminating process to grasp the structure of the data file on the disk 90. For this purpose, a transfer request for specific identification data is made. In this case, since the discrimination data has already been read out from the disk 90 and buffered on the playback device 70 side as described above, it is sufficient to only perform a cache hit transfer in response to the transfer request, and it is necessary to perform disk access Absent. That is, since there is no need to access the disk in response to the data transfer request at the time t3 in FIG. 3, the data transfer can be completed very quickly, whereby the file system recognition processing in the host computer 80 can be completed quickly. Therefore, it is possible to reduce the time until the actual application or content can be reproduced / transferred.

Hereinafter, a specific example of the determination data of the file system will be described. For example, FIG. 4 shows an example of a volume structure of a UDF bridge (Universal Disc Format Bridge) as a file system adopted for a DVD. This UDF bridge is ISO966
This is a file system having a certain degree of compatibility with the file system 0, and the contents of LBA “0” to LBA “20” are the same as those of the ISO9660 file system.

For example, when a CD-ROM is considered, the ISO
9660, PVD to LBA "16"
(Primary Volume Descriptor) is described, and as the information of the PVD, information indicating the features of the application and the like recorded on the disc is described. Considering a DVD adopting the UDF bridge, as shown in FIG. 4, the LBA “256” is “Anchor Volume Descri
ptor Pointer ", and here is PVD as UDF
Is recorded.

When the host computer 80 determines whether the file system is an ISO9660 or a UDF bridge, the information of LBA "16" and LBA "256" is the above-described determination data. Host computer 80
If it determines between ISO9660 and UDF bridge,
First, a transfer request for data of LBA “256” is issued to the playback device 70. If the address information describing the PVD can be confirmed as the data of the LBA “256” transferred from the playback device 70, the disk 90 is determined to be a UDF bridge compliant disk. On the other hand, as data of LBA “256”,
If the address information in which the PVD is described cannot be confirmed, the host computer 80 subsequently proceeds to the LBA “1”.
6) is issued. And the playback device 7
As data of LBA “16” transferred from 0,
If the PVD information can be confirmed, the disc 90 is ISO
The disc is determined to be a 9660-compliant disc.

Since the host computer 80 performs the above-described determination, at least the playback device 70
If the information of LBA “16” and LBA “256” is read as the process of step F106 described above,
When these data transfer requests are made, Step F10
As a process of 7, cache hit transfer becomes possible,
Processing can be made very fast. The host computer 8
0, depending on the type of the actual OS (operating system), not only the information of LBA “16” and LBA “256”, but also other information, for example, LBA in FIG.
In some cases, a transfer request of “17”, LBA “0”, LBA “1”, or the like may be made. Therefore, it is preferable to read them in advance. For example, Step F106
, Data from LBA “0” to LBA “256” may be read and buffered.

Of course, the present invention is also effective in a system for recognizing various file systems. In any case, the reproducing apparatus 70 sets the discrimination data required from the host computer 80 to the READY state. The data may be read from the disk 90 and buffered later.

[0035]

As described above, according to the present invention, even when no data request is issued from the host device at the time when the reproducing apparatus is in the READY state, the recording is performed from the loaded recording medium. The discrimination data necessary for discriminating the file system of the data recorded on the medium is read out, and when the discrimination data is requested from the host device, the discrimination data stored is transmitted to the host device. The control is performed such that the data is transferred and output. Therefore, when there is a request to transfer the determination data, the data can be immediately transferred to the host device without accessing the recording medium. In other words, the present invention speeds up the process up to the file system recognition by effectively utilizing the time until the data transfer request is actually generated before the data can be accessed in the READY state.
There is an effect that efficiency can be improved. This can reduce the user's waiting time. Furthermore, in order to realize such processing of the present invention, it is only necessary to devise firmware of a so-called reproducing apparatus, and there is an advantage that there is no need to change the hardware configuration.

[Brief description of the drawings]

FIG. 1 is a block diagram of a playback device according to an embodiment of the present invention.

FIG. 2 is a flowchart of a process of the playback device of the embodiment.

FIG. 3 is an explanatory diagram of processing and communication operations of the playback device and the host computer according to the embodiment;

FIG. 4 is an explanatory diagram of a volume structure of a UDF bridge.

[Explanation of symbols]

1 pickup, 2 objective lens, 2 biaxial mechanism, 4
Laser diode, 5 photo detector, 6 spindle motor, 8 thread mechanism, 9 RF amplifier, 1
0 system controller, 13 interface unit, 14 servo processor, 20 cache memory, 70 playback device, 80 host computer, 90
disk,

Claims (3)

[Claims] 1. A reproducing device for transferring data recorded on a recording medium to a host device in response to a data request from a host device, wherein the reading device is capable of reading data from the loaded recording medium; A storage unit capable of storing data read from a recording medium by the reading unit, and a point in time when an initial operation for enabling read access to data recorded in the loaded recording medium is completed. Even if a data request from the host device has not been issued, determination data necessary for determining a file system of data recorded on the recording medium is loaded from the loaded recording medium to the reading unit. The storage means is read and stored in the storage means, and when the determination data is requested from the host device, the storage means And a control means for performing control so as to transfer and output the discrimination data stored in the host device to the host device. 2. The reproducing apparatus according to claim 1, wherein the discrimination data is information capable of discriminating between a UDF bridge file system and an ISO9660 file system. 3. An information system comprising a playback device and a host device, wherein the host device recognizes a file system of a recording medium loaded in the playback device as a file system recognition method. A procedure for performing an initial operation for enabling read access to data recorded on a medium, and the initial operation is completed, and various types of information communication for initial setting are performed between the host device and the playback device. Executed, the reproducing apparatus reads out the discrimination data for discriminating the file system of the data recorded on the recording medium from the recording medium and stores the discrimination data; and And discrimination data for discriminating a file system of data recorded on a recording medium loaded in the reproducing apparatus. Requesting the playback device to transfer the stored discrimination data to the host device, and the host device recognizing the file system based on the transferred discrimination data. A file system recognition method characterized by the following.